Harrow-tooth.



J. WHIPPS. HARROW TOOTH.

APPLICATION FILED SEPT. 7, 1910.

Patented Mar. 7, 1911.

Witnesses filfnven tor I Att orneys UNTTED @TATES PATENT @FFTQE.

JAMES WHIPPS, OF CARLISLE, INDIANA.

'HARRow-Too'rrr.

To all whom it may concern:

Be it known that 1, JAMES WVrIIPrs, a citizen of the United States,residing at Carlisle, in the county of Sullivan and State of Indiana,have invented a new and useful l'larrow-Tooth, of which the following isa specification.

This invention relates to a harrow tooth and consists in the novelconfiguration of the same as hereinafter shown, described and claimed.

The object of the invention is to provide in the form of a unitarystructure a harrow tooth having a shank portion of usual pattern wherebythe tooth may be applied to any harrow frame in general use, the saidteeth having a lower portion of peculiar configuration adapted to cutinto the upper portion of the soil without materially disturbing orturning the same, but at the same time effectually reducing the soil topulverized state preparatory to subsequent rolling and planting.

In the accompanying drawing, Figure 1 is a side elevation of the harrowtooth. Fig. 2 is a rear edge elevation of the same. Fig. 3 is a frontedge elevation of the same. Fig. el is a transverse sectional view ofthe lower portion of the h arrow tooth cut on the line l4t of Fig. 2.Fig. 5 is an end view of the harrow tooth.

The harrow tooth is formed from a sec tion or bar which in its originalcondition is of the same transverse sectional area throughout its entirelength. The harrow tooth is forced or pressed up into its final stateand is not twisted as is commonly the practice. The bar or blank fromwhich the tooth is formed is provided with the upper shank portion 1which is rectangular in transverse section. A blade portion 2 is formedat the lower end portion of the shank 1. The blade portionQ is providedwith a forward cutting edge 3 the upper portion of which is in alinementwith the forward corner of the shank portion 1. The said cutting edge 3and the blade 2toward the lower'end of the teeth are curved. in alateral direction. It makes no difference to which side the saidcurvature is made as teeth of Specification of Letters Patent.

Application filed September 7, 1910.

Patented Mar. '7, 1911.

Serial No. 580,827.

either pattern may be provided. The upper portion of the back 1 of theblade 2 is in vertical alinement with the rear corner of the shankportion 1 of the harrow tooth and the said back 4 in a similar manner asthat described in connection with the cutting edge 3 is curved to oneside or the other of a medial plane passing through the shank portion 1of the harrow tooth.

As has been hereinbefore stated, the harrow tooth is made from a sectionof bar which is of the same transverse sectional area throughout and theblade portion 2 is formed at the lower end of the shank por tion 1 byforging or pressure; therefore the material in the said blade portion 2is of the same transverse sectional area throughout the length of thesaid blade and the same transverse sectional area as the materialcontained in the shank portion 1. The edge 3 describes a shorter curvethan the curvature of the back 4, consequently the tip 5 of the harrowtooth is so disposed that the said tip may lie in a line parallel with ahorizontal line when the harrow toot-h is in position in a harrow frameor bar and at an acute angle to the surface of the ground. Thus whenharrow is equipped with a series of teeth as described the upperp0rtions of the cutting edge 3 will operate in the surface of the soiland make an incision while the lower portion of the cutting edge 3 willoperate below the surface of the soil and open a curved. incisiontherein but the shape of the blade 2 is such that the soil will not bedragged or spaded but will be loosened and left approximately in itsoriginal location but in a condition adapted to receive subsequenttreatment preparatory to planting.

Having described the invention what I claim as new and desire to secureby Letters Patent is:

A harrow tooth formed from a bar of uniform transverse sectional areathrougln out its length and provided at its upper end with a shankportion which is rectangular in transverse section, and a blade forgedat the lower end of the shank and provided with a cutting edge, theupper portion of which is in alineinent with the forward cor- Intestimony that I claim the foregoing ner of the shank portion, the upperportion as my own, I have hereto aifixecl my s1gnaof the back of theblade having its niecllan ture in the presence of two witnesses.

line in alinenient with the rear corner of JAMES VVHIPPS. the shank ofthe tooth, the lower portion YVitnesses:

together with the cutting edge and back be- JAMES R. PILMER,

ing curved laterally. SALATHIEL BOONE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

